Vacuum-tube lamp.



D. MOP. MOORE. VACUUM TUBE LAMP. APPLIOATION FILED mm", 15,1904.

Patented July 16, 1.912.

INI/ENTOR 4mm I ATTORNEY While in other cases,

- cation.

unirnn sanrss rntrniirr we Twi it tie it DANIEL MOFABLAN M00313, 0F

NEWARK, NEW JERSEY, ASSIIIGNOR I'ti ii filiil'lil ihli'i specification of Letters it'steat.

Patented July 1% ti, timid.

'Applicntlon fllzatlt 'lme 15, 190i. Serial No. stasis.

To all whom it may comm;

Be it imown that I, DANIEL Mci iinmn Moore s. citizen of the United States, and a resident of Newark, in the county of Essex and State of New Jersey, with post tiice address as above, have invented certain new and useful Improvements in Vacuum-Tube Lamps, of which the following is a specifi- My present invention relates to that class of devicescmployed for lighting and other purposes, and comprising essentially a sealed receptacle containing a rarefied gas through which electric energy is passed for the purpose of rendering the contents of the receptacle luminous, or for other purposes. In this class of devices as ordinarily constructed, the receptacle consists of a tube of translucent material, like glass, and ience when employed for lighting, such devices are ordinarily termed vacuum tube lamps. The means for transferring enz. ergy to the gaseous contents of the tube consist, in some cases, of exterior conducting caps or sleeves by which alternating orvibrating electricvenergy is transferred electrostatically to the contents of the tube, the transfer is accom plished by electric conduction from electrodes sealed into the receptacle and located Within the inclosure but suitably connected through the Walls'of the receptacle with the source of energy.

While for brevity, I employ in the sub joined description and in. the claim the term vacuum tube lamp,ar1d While I have described my invention as applied to a tube with terminals suit-able for electrostatic transfer of the energy, I do not limit myself to any particulanform of receptacle or of electrodes, but by the term vacuum tube lamp include all forms of receptacle and constructions of electrode. My invention further includes all devices of the general character above described, irrespective of the contents of the receptacle, and hence includes Riintgen ray tubes.

Briefly stated, my invention consists in a vacuum tube lamp Whose contents embrace pure carbon in a finely divided state Whether amorphous or graphitic, in addition to a tenuous gas orits equivalent, of any character which may or may not be, derived from the carbon. It the tenuous conductingmedium is derived solely from the carbon,-it

is impossible to stste its exact neture, since nil authorities agree thet carbon has never been gasefied.

By the; expression pure carbon in a fine divided state 7! do not include lamp blac and soots resulting from tlanies'from whatever source, because they are so impure that they come under my application tiled Sept. 2nd, 1903, Serisi No. 171,582, but which has since been subdivided; Scots and all compounds of their class seldom contain more than carbon, the remainder consisting of resinous matter and oily substances containin hydrogen, oxygen, nitrogen, sulfur, &c., spending, or course, upon their source. But one Way ofobteining pure amorphous carbon is to pass carbon tet-rachlorid CCl, vapor over pure hot metallic sodium in a hard, glass tube, and then heating the carbon obtained to a little nnt dcr the temperature at Which'burning" begins. Another method of obtaining nely divided amorphous carbon is to pass electric sparks through acetylene gas which is decomposed into its elements carbon and hydrogen.

Although I prefer to use amorphous carbon, because of its lightness, nevertheless my invention broadly covers also the use of finely divided graphiti'c carbon, such as can easily be obtained in the open market,

The finely divided carbon is introduced within the vacuum tube in any" desired Way but preterably near or Within the ele odes In exhausting such a vacuum tube, it seems best to exhaust; the tube before the electric current applied, in order to avoid. the possible formation ct any cornpoiuid oi? car'- bon with the nitrogen or oxygen. brother gases present in the atmosphere, the idea being: to retain finely divided carbon only within the walls of the vacuum t l to act; as the gaseous conducton Howe dc sirable, after such treatment, any gee gases can be admitte electric current the exhaust-ionic cunt-in. until the vacuum reaches the as l stage at which the luminosity is the main nun and beyond which the luminosity would de-- crease, as Well understood in the artu In the accompanying drawings, the fig ure shows a side elevation of a vacuum tube lamp in which my invention may he enibodied.

The terminals of the lamp consist oi.

After applying 1 tln: usual cmnlncling raps, pwlwiably of gi'zzphilu, which are [HHs'lllOll wnn [n0 mnmm ring 01' sleeve 2, for me lln elm-hi0 "\H'lflll. \li\ nlwl state is introduced inln liw end 5P4?- f'nms m ax m lie preferably within the 00nvlnsling terminals nnll rlilll terminal sew ri n can be sealed to the internnzdiate sew manufacturing vncnun'i lube lumps cons nppiiunliun of l The (mlmn In :1 linely Linn L ll) pz'mlnw a (zon'iplete lamp. The HEJlUlg all is dime In llw usual Way. The

lines 015 jinn-lion n'f tlw enrl au llun to the nnldle swnons are nnluznlml at the (lflllml me v What I clam. as my m'ventwn 151 lhe nerein (luscrlbed improvement U ing in inl'roducing into the tulle carbon in a linvly divided state, sealing and pumping llnlulm l0 aihigli vacnmn and $nl mnwnlly applying the electric min-lent while :nnlinn ing llw oxl'mnsliunin (111161 l0 unild fnrnnv linn nlf cmnpmnls nlf (rzu-lmn Willi nilingen and oxygen.

Signed a1 York unll'fi lulc 0. Nmv Yin-k (lay in June A. l). ISO-L.

LXXXTEL MUFARLAN NEH/RE. \(it nusses (f. F; Txscnxun, J12, Zn Axru B. TALLBIAN.

New York in (lie wnnly of this l llli 

